Luffing-crane.



R. CAREY. LUFFING CRANE. APPLIOATION'IILED Jun: 11, 1909.

Patented Mar,8,1910. 2 SHEETS-SHEET 1.

w m n 5 J2 &

R. GARY?" LUPFING (IRA KB. v

APPLICATION IILED JUN E 11; 1909. 951,433. Patented Mar. 8, 1910.

2 SHEETS-SHEET 2.

' To all whom it may concern:

'ROBERT CAREY, OI WIMBLEDON, TLIIII'TDON WAYGOOD & COMPANY, LIMITED, OF LONDON, ENGLA ENGLAND. ASSIGNOR 0F ONE'HALF TO B.

LUFFING- CRANE.

Be it known that I, ROBERT CAREY, a subject of the King of England, and residing at'22 Quintin avenue, Wimbledon, London, England, engineer, have invented certain new and useful Improvements in Luffing- Cranes, of which the following is a full, clear, and exact description.

. This invention relates to cranes and the like having a luiiing or derricking jib and it consists of an improved arrangement of the parts whereby the jib can be made self-sustaining in all positions, whatever be the weight of the load suspended, by rendering the elevation of the load independent of the luiiing action. The present invention enables this object to be attained with an accuracy sufficient for all practical purposes. c

According to the present invention, the jib extends rearwardly beyond, its support and carries on the side remote from the load a number of compensating pulleys or sheaves around which the rope, chain or other con nection is passed, the arrangement being such that the point of attachment of the pul-' 'leys to the rearward prolongation of the jib is in approximate alinement with the pivots of the jib and the head-sheave; the moment y the moment of the pull of the ropes upon these compensating pulleys. The number of such pulleys will depend upon the length of the jib in proportion to the distance of the thence along the jib to and over the pulley 'orshea've at its extremity. The axes of the two sets of compensating pulleys are so placed that as the jib is raised or lu'iled to bring the load nearer to the crane the dis tance of the line of action of the compensating lengths of rope or chain from the pivot of the jib is reduced in proportion ill-orderto preserve the-balancing effect. This may be accon'iplished, for example; by causing the ropes upon the compensating pulleys to remain approximately vertical in all usual positions of'the jib, :or otherwise causing the Specification of Letters Patent.

Application filed June 11, 1909. Serial No. 501,594.

, pivot 6 roduced by the load suspended is balanced Patented Mar. 8,1919.

pull. of these ropes to have the greatesteffect when the jib is horizontal. Any slight inequality in the compensating action resulting, for example, from a small divergence from the vertical line will inset ficient to overcome the ordinary friction of the parts, so that'this approximation may be regarded as sufficiently accurate for practical working.

The invention is hereafter described with reference to the accompanying drawings, in which Figure 1 represents by way o'f'example and in side elevation an electric lufiing crane constructed in accordance with the present invention. Fig. .2 is .a similar view in part section. Fig. 3 is a rear elevation of the same. Fig. "4. is a detail showing the lufiing gear. Fig. 5 represents .in side elevation a hydraulic crane constructed in accordance with a modification. Fig. 6 is a similar view in part section. Fig. 7 is a rear elevation of the same.

In the construction illustrated in Figs. 1, I 3 and 4, the crane is provided with .a double framed standard a revoluble uconical rollers b traveling on the'fixed base Z) in conjunction with .a central guide .or

The jib .c is pivoted at c and carries at its outer end a pulley or headsheave over which the "rope or chain a. supporting the load is passed. .On theside remote from the load, the jib 0 is exflsnded as at 0 beyond its pivot c and-provided with an axle 6 upon which are journaled n 08 number of compensating pulleys or sheaves f. A corresponding number of pulleys g are mounted upon an axle h on thei'icame of the standard a. The rope d which suetains the load passes over a guide-pulley j, $5

preferably 'mounted upon the'pivot c of the jib, and over the twosets of pulleys g From the last ofth'e pulleys "7 to V the Winding :wfhichis npon supports Z and rotated by 'smtahlefgemmg such as the worm -wheel =2 and actuated by the electric or Any suitable means for 'controll-m'gifihe tion' of the. :jib a may beeinployedggiforiln stance, as shown in Fig. 4, a toothetl goad fi rant asecu'red aipon the extended jib 13 83: gaged by a'pinion a mounted npona shaft v. This shaft 4) .is rotatable in either direction by an electric motor on which operates "a worm as engaging witha worn] "wheel a).

sus ended.

-u on theshaft. The rearward extension o the jib may be provided with a counter- 'poise n to'fbalan'ce the weight. of the jib,

which is of course. independent of the load n Figs. 5, 6, and have shown an application ofthe invention to a hydrauliccrane. v The jib c is pivoted at 0 upon the standard-a revoluble' 'upon its base'b, and.

upon its rearward ext ension'c are mounted two oscillating cylinders o p to receive the hydraul c power under suitable control. The

two c linders are secured together by a flange joint 0 and oscillate on the trunnionsor. axle e, through which the power maybe supplied. The compensating sheaves f are carried by the ram 9 of the hoisting g cylinder 0" and connected to the stationary sheaves, g asain the previous construction.

fQne end offfthe hoisting rope or chain cl is anchoredto the standard a as at d. while ajthe otherfpasses over the guide pulley j and alongj-j-the' jib a to thejpulley r at its extijiemityfromwhich the load depends. The lufiing cylinder p is preferably double-acting and its piston-rod s is connected to'the axle .h fixedupon the standard'a. 'A tail-rod t passes out through a stufiing box' h at the top of the cylinder. The lufiing cylinder p with its piston-r0d s maintains the hoisting cylinderp in the direct line of the ropes or chains because of the rigid connection of the two cylindersI""In this construction the weight of the two cylinders 0 79 may be designed 'to balance the jib with or without the jib is has.

any other c'oun-terpoisen- It will'be noted that' as toward the position shown in dotted lines,

the motion of the compensating pulleys "causes the rope or chain to travel so that the load remains at approximately the same elevationfiwithout rotation ofthe winding'drinn k or travel of the. hoisting ram (1 in its cylinder 0, as the case maybe. This isof great advantage when the position of the crane requires-the jib to be constantly or for said jib, a flexible connectio siippoifting a load (lepelldent'flQiliaflldmllb,1111,982 tension of said jibto; rear said: pivot, an axle u on said extension, a 'fixed; axle-,5 and I a num er of loops in saidjflexible connec-.

tion, said 100 s passing] around; said-axle and said fixe ax 2. A lutling crane 'coinprisingia sta-ndard,

a jib, a ivot for said jib upon said-standard,

aflexib e connection supporting. a load deendent from said jib, anextension of said jib-tofrear of said pivot, an axle uponsaide,xt ension, an axle upon said stand 21 number ofloops in said flexibleco pivot for said jib, a head-sheave upon said a jib, a pivot for said 'i upon said stand a jib, a pivotjfor said j1 "locatedat the top of said standard, a flexi ble gnnnection supporting a load dependent passing around said axles.

3. A lutfin crane. comprising a jib, a

ib, a load supportin 'flexible connection. passing oversaid hea sheave, an extension of. saidjib to rear .of said pivot, an axle upon said extension, said pivot, head-sheave and axle having axes inapproximately the same plane, a fixed axle,and a number of loops in said flexible connection passing around said axles. p,

4. A lufiing crane comprising a standard, a jib, a pivot forsaid ji said pivot bein located at the top of said standard, ahea sheave upon sa d jib, a.load'-supporting flexible connection over said headshe'ave', an extensionof said jib to rear of'said pivot, an axle uponsaid extension, said -.pivot, head-sheave and axle having axes in approximately the same plane, an axle upon said standard, and a number 01-1005 in saild flexible connection passing aroun said ax es. 4

5. A luiiing crane com rising a standard, a jib, a pivot for said ji" upon said stand.- ard, a flexible connection supportingat one end a load dependent from said'ib, an ex tension of said jib torear of sai pivot, an-

axle upon said extension, an axle u on said standard, a-number of loo s in sai flexible connection passing arou'n ,.saidaxles, and means for retaining theotlienend of said flexible connection. I ,fl

6. A luiiin crane com rising in jib, a pivot for sai jib, a flexi lb connection supporting aj load'd'ependent from said jib, an extension of'said "-ib tog-rear of said pivot, an axle upon sai extension, a fixed axle, a. number of loops in said :flexible connection around said axles and means for lufiing saidji b.-

A fluttin pivot for sai jib, a flexible connection supporting a load'dependent frornsaid jib, an extension of said jibflto rear of said pivot, an axle upon said extension, a fixed axle, a number of loops in said flexible connection passing aroundsaid axles, means for Int!- crane comprising a' jib, a

.ing saidrjib, and means for'hoisting the load dependent from said jib.

8. A lufiing crane com rising a standard,-f

ard, a flexible connection supporting a load 120 de 'endent from 'said jib, an. extension of saidv jib to'rear of said pivot','-' an axle upon said extension, an axle 'u on said standard,

a number of loops insaid flexible connection 'ufling'saidjib. 1 V

9, A lufling crane comprising a standard,

' sai pivot being nectioii around "upon said jib-pivot, a load-supporting flexipassing, around saidaxles.

. pivot for said jib,

tween said side supporting a load dependent from saldfllb,

'ing betweensaid side-frames, and a number rear of said men, an axle-upon connection supporting a jib, a pivot for saidjib upon said stand tensiomaii axle upon said standard, and a ib, an extension of from said said jib to pivot,a'n axle upon said extensaid standard, a number s in .said flexible connection passing ofloo r iroun for lufliiic said jib,

I saidv axles, means and means forlioisting the load Tc ependei t from said jib. i

10. A lufliiig crane comprising a base, a standard. said standard revoluble upon said base, a jib, a pivot for saidjib upon said standard, a flexible connection supporting a load dependent from said jib, an extension of said jib to rear ofsaid pivot, an axle upon said extension, an axle upoii said standard, anda number of loops in said flexible consaid axles.

11. A lufling crane comprising standard. a central guide for said standard upon said base, conical rollers.- supporting said standard upon said base,fa jib, a pivot for said jib upon said standard, a. flexible a load dependent from said jib, an extension of said. jib to rear of said-pivot, an axle upon said extension, an axle upon said standard, and a number of loops in said flexible connection around saidaxles.

a base, a

12. A lufling crane comprising a standard, ard, a head-sheave upon said jib, a sheave ble connection over said head-sheave and said p vot-sheave, an extension of said jib to rear of saidpivot, an axle upon said exiiuniber of loops in said flexible connection 13. A. lufling crane comprising a jib, a pivot for said jib, a flexible connection sup-' porting a load dependent from said jib, an extension of sai d jib torea-r of said pivot, an axle upon said extension, a fixed axle, and a number of loops in said flexible connection passingaround said axles. 1

14. A lufliiig crane comprising a jib, a aflexible connection sup portinga load dependent from said jib, an extension of said ib to rear of said pivot, a counterweight upon said extension to balance said jib, an axle u on said extension, a fixed a'xle,and a num ervof loops in said flexible connection around said axles.

15. A lufli-ng crane comprising a standard, two side frames to said standard, ajib, a pivot for said jib, said pivot extending be-1 frames, a flexible connection an extension of said jib to rear of said pivot, an axle upon said extension, an axle extend of loops in said flexible connection passing around said axles. v 16. A lufling crane comprising a base, a standard revoluble upon said base, a central guide for said standard upon said base, con

ical rollers supporting said standard upon said base, a pivot being located at the top jib, a pivot for said jib, said.

Oren-(isms ard, aliand-sheave'upoii said jib, a sheave [upon said jib-pivot, a flexible connection supporting at one end a load dependent from said jib, said flexible connection passing over said hcad sheave an extension of said ib to rear of said pivot, an axle upon said extension, an axle upon and said pivot-sheave,

said standard, a number of loops in said flexible connection passing-around said'axles, means for retaining the other end of said flexible connection, jib, and means for pendentfrom means for lufling said hoisting the load desaid jib. 17. i lufling crane comprisinga' jib, a

pivot for said jib, a flexible connection supporting a load dependent from said jib, an extension of said jib to rear of said pivot,

an axle upon said extension, a fixed axle, a

hydraulic cylinder, a piston and to said hydraulic" cylinder,

piston-rod said hydraulic cylinder and piston-rod being pivoted on said axles, and a number flexible connection '18..A lufling crane comprising a jib, a pivot for said jib, a flexible connection of loops in said passing around said axles.

sup-

portinga load dependent frorn'said jib, an

'extenisonof said-jib to rent ofsaid an axle upon said extension, a fixed hydraulic lufling cylinder, iston rod'to saidcylinder, said pistonlerod pivot, axle, a piston and eing pivoted on'said fixed axle, a hydraulic hoisting cylinder, a ram to j cylinder, said lufling and hoisting cylinders said hoisting being pivotedon said axle upon'saidextension, conipensat1ng sheaves carried by said ram, means for maintaining said. cylinders ble connection passing said. compensating sheaves.

arallel,

and a number of loops insaid flexiaround said axles and 19. A lufling crane comprising a jib, a

pivot for said j'b, a flexible connection. sup:

porting a load dependent extension; ofsaid jib to rear of said pivot,

from said 'ib, 3I1'l10 an axle upon said extension, a fixed axle,

compensating piston-rod .to

sheaves upon said fixed axle, hydraulic lufling cylinder, a piston and said cylinder, said piston-rod being pivoted upon said fixed axle, a hydraulic cylinderfa rain to said hoisting cylinder, said lufling 'and hoisting cylinders being secured to ether and. pivoted onsaid axle upon sai 4 v sheaves carried by said ram extension, compensating and a number of loops in said flexibleconnectionpassing around said axlesfand "said sh compensating eaves. 20.. A

lufling crane comprising a standard, ib, a

pivot for said jib upon said standard, a flexible connection supporting a load from said jib. an extension of said ib to rear of sion, an

said pivot, an axle upon said extenaxle upon said standard, a hydrau- 136' t i 45 flpla'ne, and a number of loops in said flexible connection passing around the'said axles and oted o,n said axle hydraulic hoisting cylinders being pivoted on said axle upon said extension, compensating sheaves carried ried by ram,'said-axles and said coin pensatingsheaves having/their axes in the of said pivot, an axle upon said extension, a

proximately vertical plane, and a number of ,jib to rear ofsaid pivot, an axle upon said lic'luiling cylinder, a piston and piston rod to saidcylinder, sa d piston-rod being pivupon said standard, a cylinder, aramto said hoisting cylinder, said lufling and hoisting cylinders being "pivoted on said axle upon said extension, compensating sheaves car same plane, and a number of loops in said flexible connection passing around said axles and said compensating sheaves.

v21. A lufiing crane comprising a jib, a pivot/for said jib, a load-supporting flexible connection, an-extension of said jib, to'rear fixed axle a hydraulic lufiing cylinder, a

piston an piston-rod to. said cylinder, said piston-rod being pivoted on said'fixed axle, a hydraulic hoisting cylinder, a rain to said hoisting cylinder, 'saidluffing and hoisting extension, said pivot, head-sheave and axle having axes 1n approximately the same plane, a fixed axle, adiydrauli-c luifing cylinupon said jib-pivot,

supporting atone end a loadgdependent der, a iston and piston-rod to said cylinder, said piston-rod'being pivoted on'said' fixed axle, a hydraulichoisting cylind e1',-a ram to said hoisting cylipder, said=luffing and hoisting cylinders being pivotedon said axle upon said exteirsicmfcompensating sheaves carried by said rain, said axles and conipensating sheaves having their axes in thesarnecompensating sheaves.v

23. A luffin'g'crane co n ivotlfor said jib, a head-s eave upon; said ]lb,, :1 load-supporting flexible connection over said head-sheave, an extension of said In testimon rising a1 jib, a

jib to rear of said vpivot, maxiupon said extension, said. pivot, head sheave and. axle having axes -in approximately-'the s'aine plane, a fixed axle, a 'hydraulic lufii n'g cyl-f inder, a piston and, iston-rodto saidcyhn der, said piston-r being pivoted on said fixed axle, a hydraulic hoisting cylinder,- a

ram to said hoisting cylinder, said luflin and hoistingcylinders being pivoted on said axle upon said extension, sheaves carried by said rain, the ,said axles and compensating sheaves, havingitheir axes. in the same approximately vertical plane, and a number of loops in saidflexible connection passing aroundthe said axles and compensating sheaves.

compensating i 24. A lufling crane comprising afbase, a

standard revoluble upon said base, a central guide for said standardup'on said base,- consaid standard upon';

ical rollers supporting said base,'a jib, a pivot for said jib, said pivot being 1 ard a head-sheave upon said jib, a sheave.

' a flexible connection from said jib, sald flexible connection pass ocated at the top of said standing over said head-sheave and said pivotsheave, an extension of said -ji-b' torear' of i said .pivot, an axle upon said extensiomsaid pivot, head-sheaveand axle having axes [approximately thesame plane, an axle upon said standard, a hydraulic lufiin'g cylinder, a

piston and piston-rod to said piston-rod being f pivoted said standard, a hydraulic hoisting a ram to said hoisting'cylinder, sai luflmg and hoisting cylinders being secured 'together and pivoted on said axle upon'said extension, compensating sheaves carried' by linder, said l I on sa d axle u n 1 hn er,

said ram,'the said .axles- 'nd compensating sheaves having their axes ,inithe sameyap proximately verticalplane, and a numberof loops in said flexibleconricction "passing around the said axles and compensating sheavesQ f whereof'I fiix my signature in presence 0 two witnesses. i i I WVitn'esses:

Vio'ro'n F. FEENY, Oran J.Farmx.

a Ro EBT toxBiajx; l 

